MAMMALIA. 



69 



(30). It is peculiar iu possessing a complete set of teeth, -^^®'''^^^® 

 incisors and canines as well as premolars and molars. ^ 



Fragments of jaws, possibly of another species of the same 

 genus, occur in the Upper Eocene of Xortheru Italy. 





Fig. 65. — Skeleton of Halitherium scliinzi, from the Oligocene of Hesse- 

 Darmstadt ; one twenty-fifth nat. size. (Case V.) 



The oldest known Sireuians are Euthcrinm and Eosiren 

 from the ]\Iiddle Eocene of Egypt. Brain-casts, a plaster 

 cast of a skull, and other remains are exhibited in Tier-case 

 20 (30). 



Skeletons and stuffed specimens of the living manatees 

 and dugongs are placed in Case V and Pier-case 29 (30) for 

 comparison with the fossils. 8ee ■' Guide to the Galleries 

 of ]\Iammals," p. 84. 



Okdeu YIII.— CETACEA. 



The fossil remains of whales, porpoises, and dolphins are Gallery of 



placed witli the living members of the Order in the Gallery 

 of Cetacea (Department of Zo(jlogy). They are all xevy 

 fragmentary. 



The typical modern Baltenidse do not occur below the 

 riiocene, where they are represented chiefly by ear-bones 

 (tynipanics), of which a good series from the Red Crag of 

 Suffolk is exhibited (Fig. 66). Snioall whalebone whales, 

 however, existed so long ago as the Gligocene period both in 

 Europe and North America, altliough there are no remains in 

 the collection. 



Teetli and l)ones of the toothed whales are more fre- 

 ([uently met with among fcssils. All the kinds which still 

 live seem to have been in existence before the close of the 

 I'liocene period. P^ven the strange compact snouts of the 

 beaked whales, such as 3Ieso2Jlodon, are common fossils in 

 llie I'liocene Crag of P^ngland and Belgium, and a good 

 collection is mounted for exhibition. Some of tlie earlier 



Cetacea, 

 Zool. Dept. 



